Pix & ID: Critters that come in your rocks: the good and the bad.

What is this?

What is this?

I just bought this live rock from my LFS and im new to saltwater. First tank. day 3. What is this black thing above the polyp? Should I remove this or what is it? Is it decay?
 

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Is this a clear flatworm or something else? About the size of pinky fingernail. Good or bad? Lionfishlair says good if it is clear flatworm but it looks a little different.

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Hi. Just got a new coral frag and got a few of these long stringy white worms. Anybody tell me what they are and whether they are harmless. Thanks
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Thanks for the response. Can u plz also tell me how bad is this worm for FOWLR?

In most cases these are just baby bristle worms, so not harmful at all. Also, depending on what kind of fish you have in the tank, they might wind up as food.
 
Any ideas what this is. I bought my rock dry so I'm not sure where it came from... Could it be one of my snails somehow lost a shell?
 

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Just saw a couple of these in my refugium and have no clue what they are. What your looking at is the skinny worm looking thing that has a bunch of small clear whisker things coming off the one end. Sorry for the crappy picture but there are two in the photo.

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